//模拟电话输入按键
var code = 3;
switch(code){
  case 1: 
    console.log('查询话费');
    break;
  case 2:
	console.log('缴费充值');
    break;
  case 3:
	console.log('宽带办理');
    break;
  case 4:
	console.log('转接人工');
    break;
  default:
	console.log('系统维护中');
}





